Unlike a shipping package which can be moved around by a person or a shipping truck, An IP Packet is so dumped. It needs a device that can put and wrap it in a Layer-2 box then send it to another device.
Any devices (server, firewall, PCs, modem ...) that have the ability of receive an IP Packet, read its Header IP information then forward to the next device are called routers. Routers rely on its routing table to forward a received IP packet.
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